Hold-down rollers for planers and the like



FeB. 5, 1957 R. E. CARPENTIERE HOLD-DOWN ROLLERS FOR PLANERS AND THE .LIKE

Filed May 5, 1955 1PM! 4 Jar 0 United States Patent HOLD-DOWN ROLLERS FOR PLANERS AND THE LIKE Rudolph E. Carpentiere, Milford, N. H., assignor to Williams & Hussey Machine Corporation, Milford, N. H., a corporation of New Hampshire Application May 5, 1955, Serial No. 506,166

Claims. (Cl. 144-249) This invention relates to machines, such as thickness planers, in which it is desirable yieldingly to hold the stock down against the bed or table as it is fed through the machine.

Objects of the invention are to provide hold-down means which is simple and economical in construction, which can be assembled and disassembled quickly and easily, which can be readily adjusted for different thicknesses and pressures throughout wide ranges, and which is durable and reliable in use.

According to the present invention the machine comprises a bed, a cutter head over the bed, a cutter on the head to operate on stock fed over the bed, a roller on the head to hold the stock against the bed, arms pivotally mounted on the sides of the head to swing about an axis offset from the roller axis lengthwise of the bed, opposite ends of the roller being journaled in the arms respectively, a cross-piece interconnecting the arms above the roller, a pin extending upwardly from the cross-piece into an opening in the top of the head, and a compression spring surrounding the pin between the cross-piece and said top of the head yieldingly to urge the roller toward the bed. The aforesaid pin may be fast to the cross-piece and extend through a slot in the head so as to limit the downward movement of the roller by engagement with the end of the slot, or the pin may have its lower end bearing on the cross-piece with its upper end sliding in a guideway in the top of the head, in which case the guideway preferably comprises a tube threading into the opening in the head, the lower end' of the pin having a head bearing on the cross-piece and the upper end of the tube having an interior shoulder, the lower end of the coiled spring hearing on the head of the pin and the upper end of thespring bearing on the aforesaid shoulder.

For the purpose of illustration a typical embodiment of the invention is shown in the accompanying drawings in which Fig. 1 is a vertical section of a planar such as disclosed in the application of Thurston V. Williams, Ser. No. 506,266, filed on even date herewith;

Fig. 2 is a section on line 2-2 of Fig. 1; and

Fig. 3 is a section on line 3-3 of Fig. 2.

The particular embodiment of the invention chosen for the purpose of illustration comprises a bed 1 over which the stock S is fed, posts ZeXtending upwardly from one side of the bed, a cutter head 3 slidable up and down on the posts 2, and a bolt 4 for locking the cutter I head in adjusted position on the posts.

As shown in Figs. 1 and2 the cutter head has a front.

wall 6, a rear wall 7 and side walls 8 and 9, the top and bottom of the head being open. Inside the head is a cutter 11 having trunnions 12- journaled'in the side walls. The cutter may be rotated in any suitable way as for example by means of a belt 13 and a pulley 14 on one of the trunnions. As shown in Fig. 1 the crosssectional outline of the cutter is a parallelogram and the blades 12 are mounted in recesses in opposite sides of the cutter, with their edges projecting beyond the acute 2,780,254 Patented Feb. 5, 1957 corners of the parallelogram, by means of bolts 16 extending through openings which intersect the blade recesses equidistantly from the obtuse corners of the parallelogram so that each bolt may serve to secure each blade and the blades may be identical. This cutter is described and claimed in a copending application of Lucius W. Grotto, Ser. No. 560,167, filed on even date herewith Disposed over the cutter is a hood 17 which serves both as a chip breaker to direct the chips out of the machine (Fig. l) and also as a guard to protect the operator from the cutter. The hood has a flange portion 18 extending rearwardly at the level of the upper open end of the cutter head and the rear end of this portion is pivotally mounted on the side walls 8 and 9 of the cutter head by means of a pin 19 which extends through the side wall 9 and thence into the side wall 8 where it is held by a spring detent not shown. Projecting forwardly and upwardly from the rear wall 7 under the horizontal portion 18 of the hood is a lip 21 which limits the counterclockwise movement of the hood about the pivot pin 19. The lower end of the hood 17 extends slightly below the lowermost point of the cutter so that it rests on the stock and behind the edge 22 the lower end of the hood is beveled to provide clearance so that the edge 22 can bite into the stock in case the stock tends to kick back. This arrangement is disclosed in the aforesaid copending application.

To hold the stock against the bed as it is fed through the machine, front and rear rollers 23 and 24 are journaled in arms'26 and 27 which are pivotally mounted on the side walls 8 and 9 M28 and 29m swing about axes offset lengthwise of the bed relatively to the axes of the rollers respectively. The front roller is yieldingly held down against the stock by' means of a spring 31 around a pin 32 which projects upwardly from the cross bar 33 which interconnects the two arms 26 through a slot 34 in a flange 36 on the front wall 6. The rear roller is yieldingly held down against the stock by means of two springs 36 which bear on the cross-piece 37 which interconnects the two arms 27. Each spring is held in position by means of a pin 38 extending upwardly through a tubular cap 39 which is threaded through an internal fiange 41 on one of the side walls 8 and 9. Either of the spring hold-downs for the rollers 23 and 24 may be replaced by the other construction or both construe tions may be employed on either or both of the rollers. Either of the rollers 23 or 2 5 may be power driven and in the illustration the rear roller 24 is so driven, and when so driven it is preferably provided with a rubber covering as shown at 42 in Fig. 1.

As disclosed in the aforesaid application, the drive roll is driven through the rotary cutter by kinematic means located in a housing 43 on the left side of the machine.

It should be understood that the present disclosure is for the purpose of illustration only and that this invention includes all modifications and equivalents which fall within the scope of the appended claims.

I claim:

1. In a planing machine the combination of a bed, a

cutter head over the bed, a cutter on the head to'plaue stock fed over the bed, a roller on the head to hold the stock against the bed, arms pivotally mounted on the sides of thehead to swing about an axis offset from the roller axis lengthwise of the bed, opposite ends of the piece into the tube, the lower end of the pin having a head bearing on the cross-piece and the upper end of the tube having a internal shoulder, and a coiled compression spring surrounding the pin inside the tube, the lower end of the spring bearing on said head and the upper end of the spring bearing on said shoulder.

2. in a planing machine the combination of a bed, a cutter head over the bed, a cutter on the head to plane stock fed over the bed, a roller 0n the head to hold the stock against the bed, arms pivotally mounted on the sides of the head to swing about an axis offset from the roller axis lengthwise of the bed, opposite ends of the roller being journaled in the arms respectively, a crosspiece interconnecting the arms above the roller, the top of the head having a threaded opening extending therethrough in alignment with said cross-piece, a tube threaded into said opening, a pin extending from the cross-piece into the tube, the lower end of the pin having a head bearing on the cross-piece and the upper end of the tube having an internal shoulder, and a coiled compres sion spring surrounding the pin inside the tube, the lower end of the spring bearing on said head and the upper end of the spring bearing on said shoulder.

3. In a planing machine the combination of a bed, over the bed a cutter head having a top wall and spaced side walls, a cutter journaled in said side walls to plane stock fed over the bed, a rocker comprising a cross-piece and two end arms extending lengthwise of the bed along the inner faces of said side walls respectively, means for pivotally supporting the free ends of said arms on the respective side walls, a pressure roller under said crosspiece, means for pivotally supporting the opposite ends of the roller on said arms respectively, said cross-piece and top wall having a space therebetween, a pin extending across said space, and a coiled compression spring surrounding said pin between the cross-piece and top wall yieldingly to press said rocker downwardly.

4. ln a planing machine the combination of a bed, over the bed a cutter head having a top wall and spaced side walls, a cutter journaled in said side walls to plane stock fed over the bed, a rocker comprising a crosspiece and two end arms extending lengthwise of the bed along the inner faces of said side walls respectively, means for pivotally supporting the free ends of said arms on the respective side walls, a pressure roller under said cross-piece, means for pivotally supporting the opposite ends of the roller on, said arms respectively, a pin extending upwardly from said cross-piece into an opening in said top wall, and a coiled compression spring surrounding said pin between the cross-piece and top wall yieldingly to press said rocker downwardly.

5. in a planing machine the combination of a bed, over the bed a cutter head having a top wall and spaced side walls, a cutter journaled in said side walls to plane stock fed over the bed, a rocker comprising a cross-piece and two end arms extending lengthwise of the bed along the inner faces of said side walls respectively, means for pivotally supporting the free ends of said arms on the respective side walls, a pressure roller under said crosspieee, means for pivotally supporting the opposite ends of the roller on said arms respectively, a pin fast to said cross-piece and extending upwardly into a slot in said top wall, said slot extending lengthwise of the bed, and a coiled compression spring surrounding said pin between the cross-piece and top wall yieldingly to press said rocker downwardly.

References Cited in the file of this patent UNITED STATES PATENTS 148,213 Horton Mar. 3, 1874 384,445 Hoyt June 12, 1888 429,170 Flanders June 3, 1890 750,125 Ross Jan. 19, 1904 1,407,520 Eaglesfield Feb. 21, 1922 2,664,124 Veersma Dec. 29, 1953 FOREIGN PATENTS 200,122 Switzerland Dec. 16, 1938 300,105 Switzerland Sept. 16, 1954 

